<div class="container"></div>

<style>
/* From Uiverse.io by SouravBandyopadhyay  - Tags: alert, minimalist, theme-switch, pattern */
.container {
  width: 100%;
  height: 100%;
  background: linear-gradient(
      45deg,
      transparent 33.33%,
      rgba(57, 144, 179, 0.1) 33.33%,
      rgba(0, 0, 0, 0.1) 66.66%,
      transparent 66.66%
    ),
    lightblue;
  background-size: 20px 20px;
}

</style>
    